To look after our health and hygiene is something we're told from an early age. We should wash our hands, our faces, and shampoo our hair, otherwise we could get dirty and sick. But, some people claim that our insistence on cleanliness is unnecessary, and that it's only by exposing ourselves to germs that we can grow immune to them. So, what would happen if you never washed at all? Ever? In your life? In this video, we take a look... If you're watching in smell-o-vision, beware.

These are the scientific discoveries that changed the world. For this list, we’ll be looking at the most impactful scientific breakthroughs of all time.

These important scientific discoveries will blow your mind! For this list, we’ll be looking at the scariest and strangest things that scientists have ever discovered.

For these artists, it was one and done. For this list, we’ll be looking at bands that only put out one official record.

Today, society is more medically advanced than ever before. And antibiotics are a major reason for why we stay healthy for longer. But, more and more scientists are warning that a 'Post-Antibiotic Apocalypse' is looming - where antibiotics no longer work to tackle deadly illness and disease. So, what if the worst case scenario really does happen? What if harmful germs and bacteria become immune to antibiotics? How long can the human race survive without our vital line of biological defence?

Just when you thought the regular old flu was bad... Join http://www.WatchMojo.com as we count down our picks for the top 10 movie outbreaks.

They may be irrational, but these frightening and scary phobias very real fears. Whether you refuse to go up in an airplane, can’t stand the thought of climbing a ladder, are terrified of your neighbour’s dog or get cold sweats every time you give blood; you’re not alone. In this video, WatchMojo.com counts down our picks for the top 10 most common phobias.